Stamp



FIG. 1 is a top plan view of a stamp;

FIG. 2 is a front view of the stamp;

FIG. 3 is a rear view of the stamp;

FIG. 4 is a bottom plan view of the stamp;

FIG. 5 is a left side view of the stamp;

FIG. 6 is a right side view of the stamp; and,

FIG. 7 is a perspective view of the stamp. 

The ornamental design for a stamp, as shown and described. 